add_model_folder_path: ensure unique paths by removing duplicates

folder_paths.py

@@ -200,10 +200,17 @@ def add_model_folder_path(folder_name: str, full_folder_path: str, is_default: b
     global folder_names_and_paths
     folder_name = map_legacy(folder_name)
     if folder_name in folder_names_and_paths:
-        if is_default:
-            folder_names_and_paths[folder_name][0].insert(0, full_folder_path)
+        paths, _exts = folder_names_and_paths[folder_name]
+        if full_folder_path in paths:
+            if is_default and paths[0] != full_folder_path:
+                # If the path to the folder is not the first in the list, move it to the beginning.
+                paths.remove(full_folder_path)
+                paths.insert(0, full_folder_path)
         else:
-            folder_names_and_paths[folder_name][0].append(full_folder_path)
+            if is_default:
+                paths.insert(0, full_folder_path)
+            else:
+                paths.append(full_folder_path)
     else:
         folder_names_and_paths[folder_name] = ([full_folder_path], set())
 

tests-unit/comfy_test/folder_path_test.py

@@ -7,6 +7,14 @@
 
 import folder_paths
 
+@pytest.fixture()
+def clear_folder_paths():
+    # Clear the global dictionary before each test to ensure isolation
+    original = folder_paths.folder_names_and_paths.copy()
+    folder_paths.folder_names_and_paths.clear()
+    yield
+    folder_paths.folder_names_and_paths = original
+
 @pytest.fixture
 def temp_dir():
     with tempfile.TemporaryDirectory() as tmpdirname:
@@ -30,9 +38,33 @@ def test_get_annotated_filepath():
     assert folder_paths.get_annotated_filepath("test.txt", default_dir) == os.path.join(default_dir, "test.txt")
     assert folder_paths.get_annotated_filepath("test.txt [output]") == os.path.join(folder_paths.get_output_directory(), "test.txt")
 
-def test_add_model_folder_path():
-    folder_paths.add_model_folder_path("test_folder", "/test/path")
-    assert "/test/path" in folder_paths.get_folder_paths("test_folder")
+def test_add_model_folder_path_append(clear_folder_paths):
+    folder_paths.add_model_folder_path("test_folder", "/default/path", is_default=True)
+    folder_paths.add_model_folder_path("test_folder", "/test/path", is_default=False)
+    assert folder_paths.get_folder_paths("test_folder") == ["/default/path", "/test/path"]
+
+
+def test_add_model_folder_path_insert(clear_folder_paths):
+    folder_paths.add_model_folder_path("test_folder", "/test/path", is_default=False)
+    folder_paths.add_model_folder_path("test_folder", "/default/path", is_default=True)
+    assert folder_paths.get_folder_paths("test_folder") == ["/default/path", "/test/path"]
+
+
+def test_add_model_folder_path_re_add_existing_default(clear_folder_paths):
+    folder_paths.add_model_folder_path("test_folder", "/test/path", is_default=False)
+    folder_paths.add_model_folder_path("test_folder", "/old_default/path", is_default=True)
+    assert folder_paths.get_folder_paths("test_folder") == ["/old_default/path", "/test/path"]
+    folder_paths.add_model_folder_path("test_folder", "/test/path", is_default=True)
+    assert folder_paths.get_folder_paths("test_folder") == ["/test/path", "/old_default/path"]
+
+
+def test_add_model_folder_path_re_add_existing_non_default(clear_folder_paths):
+    folder_paths.add_model_folder_path("test_folder", "/test/path", is_default=False)
+    folder_paths.add_model_folder_path("test_folder", "/default/path", is_default=True)
+    assert folder_paths.get_folder_paths("test_folder") == ["/default/path", "/test/path"]
+    folder_paths.add_model_folder_path("test_folder", "/test/path", is_default=False)
+    assert folder_paths.get_folder_paths("test_folder") == ["/default/path", "/test/path"]
+
 
 def test_recursive_search(temp_dir):
     os.makedirs(os.path.join(temp_dir, "subdir"))